I got this for my husband. He has to mow about 5 acres so he needs to sharpen his lawn mower blades more often than most. He tried it the day this arrived and was thrilled. He said it was very easy to sharpen the blades with it and that it left them with a good edge.He was surprised at how well the mower cut after that and said it was like cutting with a new lawn mower. He even let a friend borrow it to sharpen his own lawn mower blades.
Hubby says it was a great purchase and said he will buy it again as needed so I think a five star rating is fair.